VariableDeclarationStatementSyntax VarDeclaration()
{
if (Accept("let") == null)
{
return(null);
}
var idToken = Expect(TokenType.Identifier);
var varDecl = new VariableDeclarationStatementSyntax(new IdentifierNameSyntax(idToken.Value));
if (VarPrimeDeclaration() is var initExpr && initExpr != null)
{
varDecl.Children.Add(initExpr);
}
return(varDecl);
ExpressionSyntax VarPrimeDeclaration()
{
if (Accept("=") == null)
{
return(null);
}
if (Expression() is var initExpression && initExpression == null)
{
throw new Exception("Expected an expression");
}
return(initExpression);
}
}
public override ProgValue Visit(VariableDeclarationStatementSyntax syntax)
{
var value = syntax.Value?.Accept(this) ?? NoneValue.Value;
_logger.Log($"VAR: {syntax.Identifier.Name} = {value}");
_symbolTable.AddSymbol(syntax.Identifier.Name, value);
return(value);
}
